Lead Acid or Dry Battery, Which is Better for UPS?

I advice you to go for dry battries because they have great efficiency in dissipating the charges they store.

Friends know best.

Do the emergency exit lights stay on in an emergency long enough that everyone can vacate the building before the 70% charge is depleted? If the batteries can, the fact that the dry cell can be depleted to 100% is not valid reason. Does the cost difference warrant the change? Cost of rechargeable dry cell is appreciably higher. The dry cell will not last forever. Does the cost of replacements with lead acid exceed the cost of the dry cell over it's life.

Up to you to answer these question and do the math to find out if your friends are right or wrong. If wrong stop listening to your friends. They may get you fired.

well bro its not like emergency but according to current weather and our country situtation here Loadshedding Occurs, The Government Off the Electricity for 2 hours in 2-3 times per 24 hours, here 200AH Lead Acid Battery is About 285$+, and i bought two in two years. and the one i got is about dead now no enough backup, i just want to get rid of it.. if the dry battery is better. and also if you can sugges any Dry Battery Brand, will be thankful

Okay so you say that power goes down 2 to 3 times a day. Lets say it's 2. Times the days in a year is over 700 cycles. The length of time is 2 hours. If that would deplete the charge 100%. Most dry cell at 100% discharge are only good for 500 cycles. So your going to replace them in a year, pay 4 times as much maybe more and you will most likely have to get another charger to charge them.

"i just want to get rid of it.. if the dry battery is better."

If you just want to get rid of it why did you ask for advice. Sound like you have made up your mind no matter what advice anyone gives you. As far as being better depends on the application. Sounds like the lead acid battery you are using does not have the capacity to do what your doing with it. Most lead acid batteries if sized for the job will give 4 years service. It could be also that there is a problem with the charger that is causing the shorten life.

Li-ion polymer. I am a believer. Charge them up come back in 6 months and it is still charged.

Can't beat that reasoning.

Uhhh...looking at the post about frequent power outages, it would appear as though arkthebest is not in a country where Walmart is a retailer, but rather one they buy from.

Are you talking about this

versus this

or this

?????

None of these are dry. But if you have frequent deep discharge situations then the first and third ones will last about a year. The AGM batteries are deep discharge "tolerant" and will live longer.

Selection of dry and wet batteries are mostly for environmental cases... as wet batteries have acid fumes emanating, which may cause health concerns somnetimes. Rest wet batteries last longer and are rechrgeable and easily replaceable - lesser expenditure.. some even get them repaired. Consider economics and environment concerns and decide.

Only cost must not be a factor... it all depends on location and law of the land regarding concerns to environment. While considering options think of sealed batteries - which are wet bit emmissions are sealed... that may do good tecnoeconomiocally including environment.

I suggest you should use AGM battery. You should increase the battery capacity to avoid 100% discharge on every power outage.

What directly comes to mind as "dry" will not help you much!!!

This is what came to my mind...

True!! My thoughts exactly!!

This sounds like overkill for a UPS used to power emergency exit lighting.

It would work beautifully for many years.....

It's overkill and would be expensive. Why would you want a pure sine wave output? The load is emergency lighting, not datacentre equipment, and is only connected when the AC power is off.

If we are talking about one or two lights, that would be true.......but if we are talking about many, it would be a cheap alternative!!

I would increase AH capacity and stay with flooded cell lead acid batteries. I seem to have better luck with them for severe use when properly maintained. Also increase charger capacity to bring them to close to full charge between outages. Electric forklifts use flooded cell batteries and seem to last 5-10 years in daily use.

Many have said to increase the battery AH for full outage period .. But that is only by experience and guess ... Faults' time can't be predicted .. outages ... yes. Hence increasing AH capacity could be helpfull but is not the final solution.

Dump the UPS and purchase tritiated water exit signs. Instant reduced energy consumption and a short ROI time.

Our facility has had the same signs since 1986 and they still work well.

Sounds like an elegant solution, and provides a worthwhile market for decayed tritium gas recovered from nuclear torpedos.

Dear Mr.arkthebest

Dry Battery is better.

The Acid Batteries, if acid leakage occurs it will land in a serious problem and will be disastorous. Further periodical maintanance such as top up of acid level/addition of distilled water is compulsory.

Further the discharge rate is very small when compared to Dry Battery.

DHAYANANDHAN.S

Are the batteries charged? Lead acid does best if kept at full potential. In normal use they last 5 or more years. You did not say how much current is used. Getting a dry battery for the same AH might be difficult. You can't charge a dry battery. How long do you want it to work before replacement? If you go with dry, then alkaline is usually the most cost effective.